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Fhe Nautilus. 



Vol. XXXI. JANUARY, 1918. No. 3 



NEW SOUTHERN FORMS OF CARYCHIUM AND THY8AN0PH0RA. 



BY GEO. H. CLAPP. 



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Carychium exiguum floridanum new subspecies. PI. 8, fig. 4-6. 



Differs from the type by its constantly smaller size and the 

 greatly thickened lip. The shell is also more tapering, making 

 the last whorl appear swollen. 



Of 25 shells measured, from 5 different localities, the largest 

 is 1.73 X 0.81 mm. and the smallest 1.52 X 0.78 mm., the 

 average being 1.64 X 0.78 mm. 



Fig. 5, "Snapper Creek Hammock" about 8 miles south of 

 Miami, Fla., measures 1.64 X 0.72 mm. Length of aperture 

 0.63, width 0.58 mm. Average of 6 shells, 1.61 X 0.70 mm. 



Fig. 4, near Coot Bay, Cape Sable, measures 1.73 X 0.78 

 mm. Length of aperture 0.69, width 0.63 mm. Average of 6 

 shells 1.67 X 0.78 mm. 



Fig. 6, Miami, collected by S. N. Rhoads, measures 1.78 X 

 0.86 mm. South side of Miami River, about 2 miles above 

 Miami, average of 6 shells 1.61 X 0.77 mm. 



Musa Isle, edge of Everglades at entrance to Miami River, 

 average of 6 shells 1.58 X 0.79 mm. The Musa Isle shells are 

 more globose than those from tlie other localities, the diameter 

 being exactly one-half of the length. 



This subspecies is of wide distribution in Florida and I first 

 noticed it in 1895 when I collected a single specimen at Homo- 

 sassa, Citrus Co. So far as I have seen it is the only form 

 found in the Miami and Cape Sable regions. 



Carychium is apparently not present on the Florida Keys as 



